Potato Knish Casserole

A Comforting Twist on a Classic

Potato Knish Casserole takes all the comforting flavors of traditional Jewish knishes and transforms them into an easy, baked dish that’s perfect for sharing. Buttery mashed potatoes, caramelized onions, and flaky pastry come together in a warm, golden casserole that’s rich, satisfying, and full of nostalgia. This simplified version saves time without sacrificing flavor, making it an excellent choice for family dinners, holiday gatherings, or potlucks.

The Story Behind This Recipe

Growing up, potato knishes were a staple at family gatherings, always served warm with a side of mustard or sour cream. The delicate, hand-folded pastry and creamy potato filling were pure comfort. But let’s be honest—knishes take time to make! That’s why I created this casserole version, which delivers the same delicious taste with half the effort.

Instead of individually wrapping dough around each potato filling, this dish layers the ingredients in a baking dish, creating a crispy top and a soft, buttery center. It’s a little shortcut with big rewards! Plus, you can easily customize it—add cheese for an extra indulgent twist, mix in sautéed mushrooms, or go traditional with just potatoes and onions.

Ingredient Notes

• Potatoes: Russet potatoes work best for a fluffy texture, but Yukon Golds add extra creaminess.
• Onions: Caramelized onions add a deep, sweet-savory flavor essential to traditional knishes.
• Butter: Gives the casserole its rich, comforting taste.
• Eggs: Help bind the potato mixture and give the top a nice golden finish.
• Pastry Layer: Use phyllo dough for a crispy top, puff pastry for a flakier texture, or even a homemade dough if you’re feeling traditional.
• Seasonings: A mix of salt, pepper, and a pinch of garlic powder enhances the flavors.
• Optional Additions: Add shredded cheese, sautéed mushrooms, or a sprinkle of everything bagel seasoning for variety.

Step-by-Step Instructions

1. Prepare the Potatoes

Peel and boil the potatoes until fork-tender. Drain and mash with butter, salt, and pepper until smooth. Let cool slightly.

2. Caramelize the Onions

While the potatoes cook, sauté sliced onions in butter over medium-low heat until golden and soft. This takes about 15-20 minutes but is worth the effort.

3. Assemble the Casserole

Preheat the oven to 375°F. Spread half of the potato mixture into a greased baking dish, then add the caramelized onions. Top with the remaining potatoes and smooth the surface.

4. Add the Pastry Layer

Lay sheets of phyllo dough over the top, brushing each with melted butter. Alternatively, roll out puff pastry and place it over the casserole, crimping the edges.

5. Bake Until Golden

Bake for 30-35 minutes, or until the top is golden brown and crisp. Let cool slightly before slicing.

6. Serve and Enjoy

Slice into squares and serve warm with sour cream or spicy mustard.

Expert Tips for the Best Results

• Let the Potatoes Cool Slightly: This prevents the eggs from scrambling when mixed in.
• Caramelize the Onions Properly: Low and slow cooking enhances their sweetness.
• Use a Sharp Knife to Slice: Let the casserole sit for a few minutes before cutting to keep the layers intact.

Serving Suggestions

• Serve with a crisp green salad for a balanced meal.
• Pair with a bowl of matzo ball soup for the ultimate comfort food dinner.
• Enjoy as a side dish for brisket or roasted chicken.

Storage and Reheating Tips

• Refrigerate Leftovers: Store in an airtight container for up to 4 days.
• Freeze for Later: Wrap tightly and freeze for up to 2 months.
• Reheat in the Oven: Warm at 350°F for 15 minutes to keep the crust crispy.

Frequently Asked Questions

Can I make this ahead of time?

Yes! Assemble the casserole, cover, and refrigerate overnight. Bake when ready to serve.

Can I use store-bought pie dough instead of phyllo?

Absolutely! Pie dough will create a thicker, more traditional crust.

What can I add to make this even more flavorful?

Try mixing in shredded cheddar, crumbled feta, or fresh herbs like dill or parsley.

Final Thoughts

Potato Knish Casserole is the perfect way to enjoy the flavors of a classic knish with minimal effort. Whether you serve it as a side or a main dish, it’s guaranteed to bring warmth and nostalgia to your table. Try it out and let me know your favorite variations in the comments below!

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